The invention provides a method for annular addressing of a pseudo-random code random displacement sensor, which comprises the following steps: acquiring a pseudo-random code signal from a first coding channel of a physical code disc, and carrying out analog digital conversion on the pseudo-random code signal; acquiring a sine and cosine input signal from a second coding channel of the physical code disc, and carrying out the analog digital conversion on the sine and cosine input signal; acquiring count pulse and a directional signal from the sine and cosine signal after the analog digital conversion; counting the count pulse according to the directional signal to generate an increment signal; storing the pseudo-random code signal after the analog digital conversion according to the direction signal; determining initial position information of the physical code disc according to the stored pseudo-random code random signal; and determining current position information of the physical code disc according to the direction signal, the increment signal and the initial position information. The method can realize small volume and high-speed response.